STEALTHMARK · HEAD TO HEAD

All comparisons ↗

Claude Fable 5.2 vs Qwen3.8-Max-0902

Claude Fable 5.2 leads Qwen3.8-Max-0902 by 16.5 points on StealthMark, 79.8 to 63.3. It leads on all 9 benchmarks. Claude Fable 5.2 scores higher on Newton's Mirror, with its largest category advantage in reflections.

See the difference ↘
All results ↗
All results ↗

Overall StealthMark

79.8/100Overall rank 1/57
63.3/100Overall rank 7/57

General Intelligence

81.7/100
62.7/100

Visual Intelligence

76.0/100
64.5/100

Reasoning efficiency

How many reasoning tokens a model needs for the quality it delivers.

Single-step reasoning How much it reasons to understand a task

Multi-step reasoning How much it keeps reasoning as a task goes on

Cost efficiency

How much Performance you get for your money.

  • Claude Fable 5.2Not measured

BENCHMARK BY BENCHMARK

Where each model leads

  • Claude Fable 5.2
  • Qwen3.8-Max-0902
  • Other models
  • Median

DATASHEET

Specs and pricing

  • Claude Fable 5.2
  • Qwen3.8-Max-0902
  • Other models
  • Median
PricePer 1M output tokens, input below
Claude Fable 5.2: No list priceQwen3.8-Max-0902: $4.95$1.65 input
Context windowTokens per request, max output below
Claude Fable 5.2: Not publishedQwen3.8-Max-0902: 1M128K max output
Output speedTokens per second, our measurement
Claude Fable 5.2: Not measuredQwen3.8-Max-0902: 76tokens/s
SizeTotal and active parameters
Claude Fable 5.2: Not disclosedQwen3.8-Max-0902: 2.4T95B activeEstimated
Developer
Not publishedQwen / Alibaba Cloud
Released
Not published2 Sep 2026
Origin
Not publishedChina
Input → output
Not publishedText, image → text
Architecture
Not publishedMixture-of-Experts; hosted version based on the open Qwen3.8-2.4T-A95B

Full datasheets, every price and sourceQwen3.8-Max-0902 ↗

Anticipating threats and planning ahead. Collect coins while avoiding ghosts. Ghosts move before the player each turn, and collisions cost a life. 3 levels in sequence, up to 66 turns in total. Earlier moves and outcomes carry forward, testing learning across levels.

Claude Fable 5.2 77.2/100Rank 2/53

Survived 3 of 3
Foresight: complete playing field
Level 318 ptsTurn 20 / 20

Qwen3.8-Max-0902 72.4/100Rank 5/53

Survived 2 of 3
Foresight: complete playing field
Level 316 ptsTurn 20 / 20

Points per level

LevelClaude Fable 5.2Qwen3.8-Max-0902
Level 1Second Thoughts
27 ptsSurvived
27 ptsSurvived
Level 2Pressure Pot
12 ptsSurvived
12 ptsOut of lives
Level 3Hide or Flight
18 ptsSurvived
16 ptsSurvived

Cooperative planning and learning from experience. Coordinate two robots to push numbered cores onto matching sockets. Pressure plates hold doors open; moving either robot uses one turn. 5 levels in sequence, up to 152 turns in total. Earlier moves and outcomes carry forward, testing learning across levels.

Claude Fable 5.2 100.0/100Rank 1/54

Cleared 5 of 5
Latch: complete playing field
Level 520.8 ptsTurn 26 / 40

Qwen3.8-Max-0902 82.6/100Rank 7/54

Cleared 5 of 5
Latch: complete playing field
Level 520.6 ptsTurn 27 / 40

Points per level

LevelClaude Fable 5.2Qwen3.8-Max-0902
Level 1Hold the door
5.2 ptsCleared
5.2 ptsCleared
Level 2Crossfeed
10.2 ptsClearedFinished early · 1 beacon left
9.8 ptsCleared
Level 3Relay vault
19.2 ptsCleared
19.2 ptsCleared
Level 4Passing bay
18.2 ptsClearedFinished early · 3 beacons left
18.2 ptsClearedFinished early · 3 beacons left
Level 5Second thoughts
20.8 ptsCleared
20.6 ptsCleared

Newton's Mirror

Same task instructions

Physics, perspective and recursive reflections, tested together. Explore the test ↗

The judgment

Claude Fable 5.2

The composition closely preserves the principal camera relationships. Visible cyan contact, elongated crimson coating and separate airborne black paint support the required interaction sequence, with a small crimson transport overshoot. Correct broad mirror placement coexists with major omissions in nested spherical imagery and simplified emitter mapping. Core score: 105.5/170; floor-damage reward: 0/10; combined total: 105.5/180.

Qwen3.8-Max-0902

The central sphere and differentiated cyan/crimson interaction are supported. The tiny highlighted object above the sphere provides partial airborne-black evidence. The few isolated sphere and panel images preserve limited optical relationships, but most of the repeating mirror-room structure is missing. Core score: 64.5/170; including the floor-damage reward: 64.5/180.

Score breakdown

CategoryClaude Fable 5.2Qwen3.8-Max-0902
State at 600 ms24.0/2523.0/25
Camera and placement15.0/1512.0/15
Reflections80.0/12029.0/120
Materials and scale8.5/108.0/10
Floor-damage reward0.0/100.0/10

Benchmark task

A spinning metal sphere and paint in a mirrored room test physical reasoning, perspective and consistency across repeated reflections.

Selfie

Different task instructions

Visual construction and creative interpretation.

The judgment

Claude Fable 5.2

The compact mantle, eight curling rays and quiet face closely realize the requested living emblem. Controlled arm contours, coherent overlaps and restrained ornament give the design character. Shallow depth, ribbon-like arm modeling and repeated highlight bands limit anatomical and lighting complexity without compromising the intact silhouette.

Qwen3.8-Max-0902

A coherent ornamental illustration with balanced framing, appealing color and legible magical accessories. The disconnected raised wrist, incorrect raised-arm side and palm orientation, bear-like facial proportions and shallow material modeling limit execution. Clean decoration and compact spatial balance remain strengths.

Score breakdown

CategoryClaude Fable 5.2Qwen3.8-Max-0902
Task & likeness9.0/107.5/10
Anatomy & construction7.5/106.5/10
Space & placement7.0/108.0/10
Light & reflections7.0/107.0/10
Purposeful detail6.5/107.5/10
Artistry & character6.5/107.0/10
Materials & effects7.0/107.5/10
Visual integrity8.5/106.5/10

Benchmark task

Claude Fable 5.2

A coral squid with spreading arms tests connected anatomy, balanced composition and soft surface shading.

Qwen3.8-Max-0902

A floating capybara in ornate robes tests character anatomy, layered fabric and the placement of surrounding luminous forms.

Mona Lisa

Different task instructions

Precise visual recall and portrait reconstruction.

The judgment

Claude Fable 5.2

A developed illustrative portrait with controlled facial shading, connected limbs, layered scenery and distinct aged-paint and gold effects. Its frontal torso, conspicuous smile and flattened fingers limit replication and anatomical precision. Decorative finish is stronger than the underlying seated construction.

Qwen3.8-Max-0902

A recognizable, cohesive Mona Lisa interpretation with readable landscape layers and a restrained expression. Continuous body construction and clean contours support readability, but broad hands, simplified drapery, frontal symmetry and limited facial volume keep the execution basic and uneven.

Score breakdown

CategoryClaude Fable 5.2Qwen3.8-Max-0902
Task & likeness6.5/104.5/10
Anatomy & construction6.0/103.5/10
Space & placement6.0/105.0/10
Light & reflections6.5/105.0/10
Purposeful detail6.0/105.0/10
Artistry & character6.5/105.0/10
Materials & effects7.5/103.5/10
Visual integrity7.5/105.0/10

Benchmark task

An SVG interpretation of the Mona Lisa tests facial likeness, anatomy and the composition of a familiar portrait.

Beach

Same task instructions

Creativity, perspective and visual beauty.

The judgment

Claude Fable 5.2

A lively sunset beach with clear playful activity, purposeful small details and developed water reflections. Layering and supported placements hold the scene together. Schematic anatomy and the turtle's overhead viewpoint limit construction, space and artistry, while atmospheric and surface effects show greater refinement.

Qwen3.8-Max-0902

A strong stylized beach illustration with coherent sunset color, lively dolphin arcs and balanced activity. Clean contours, readable ground contact and an aligned reflection support the finish. Schematic anatomy, sparse small-subject features, flat materials and repetitive water highlights limit physical depth and refinement.

Score breakdown

CategoryClaude Fable 5.2Qwen3.8-Max-0902
Task & likeness9.0/108.5/10
Anatomy & construction8.0/107.5/10
Space & placement7.5/107.5/10
Light & reflections8.5/108.0/10
Purposeful detail8.5/107.0/10
Artistry & character8.0/108.0/10
Materials & effects7.5/106.5/10
Visual integrity8.0/108.5/10

Benchmark task

A busy shoreline at sunset tests scene composition, animal forms and the relationship between light and water reflections.

Ground Truth

Same task instructions

Physical reasoning, light and visual reconstruction.

The judgment

Claude Fable 5.2

This benchmark has not been assessed yet.

Qwen3.8-Max-0902

This benchmark has not been assessed yet.

Benchmark task

A plank, computer mouse and blueberry in a steel room test physical stability, spatial relationships, materials and lighting.

Raccoon

Same task instructions

Scene composition and interacting subjects.

The judgment

Claude Fable 5.2

A controlled action illustration with expressive animals, demonstrated riding and steering, and an energetic layered wake. Purposeful small features and articulated poses strengthen the drawing. Simplified extremities, shallow character volume and limited physical lighting remain its principal constraints.

Qwen3.8-Max-0902

The riding arrangement and steering action are readable, supported by coherent visible attachments and useful character details. Clean shapes, strong color separation and clustered foam make the scene appealing and active. Stiff anatomy, crowded controls, limited directional lighting and simple surface treatments constrain sophistication.

Score breakdown

CategoryClaude Fable 5.2Qwen3.8-Max-0902
Task & likeness8.5/108.0/10
Anatomy & construction8.0/107.0/10
Space & placement7.5/107.0/10
Light & reflections7.0/106.5/10
Purposeful detail8.5/107.0/10
Artistry & character8.0/106.5/10
Materials & effects7.5/106.0/10
Visual integrity8.0/107.5/10

Benchmark task

A jet-ski scene pairs a canine driver with a raccoon passenger. It tests the placement and contact of interacting subjects, along with vehicle construction.

Pelican

Same task instructions

Subject construction and spatial relationships.

The judgment

Claude Fable 5.2

A strong illustration with an expressive pelican, readable riding contacts and carefully constructed bicycle details. Layered plumage, basket weave and coastal scenery reward inspection. Continuous attachments support the action, while limited visible leg articulation, modest volume and weakly directional foreground lighting constrain physical sophistication.

Qwen3.8-Max-0902

An appealing graphic illustration with a recognizable pelican, readable bicycle and clean coastal composition. Steering contact and one connected pedal support the action. Ambiguous neck-to-torso construction, an unclear opposing pedal connection, shallow space and limited material and lighting effects constrain its execution.

Score breakdown

CategoryClaude Fable 5.2Qwen3.8-Max-0902
Task & likeness9.0/108.5/10
Anatomy & construction8.0/106.5/10
Space & placement7.5/107.0/10
Light & reflections6.5/106.0/10
Purposeful detail8.0/107.5/10
Artistry & character7.5/107.5/10
Materials & effects7.0/106.0/10
Visual integrity8.0/108.0/10

Benchmark task

A cycling pelican tests anatomy, riding posture and contact between the bird and the bicycle.